Sports: 10 June 2006, Saturday. Bulgaria has celebrated its first-ever semi-final appearance in an Open tournament of badminton. Petya Nedelchelva downed Kanako Yonekura of Japan 21-16, 21-19 in the women's singles quarter-finals of the five-star USD 170,000 Aviva Open Singapore badminton championships at the Indoor Stadium on Friday night. "It is a big thing to reach the semi-finals. This is badminton history in Bulgaria," Nedelchelva said grinning from ear to ear out of happiness. The Bulgarian will now play Pi Hongyan of France for a place in the final.